(B)their numbers have increased because of the endangered species act.
(E)they are an example of protecting biodiversity through the passage of laws.
Explanation: Grey whales are nearly 45 meters long baleen whales live in the pacific ocean. Grey whale species were on the line of extinction due to overhunting or whaling in the mid 90's but due to the protection given under Endangered Species Act, its number increased now to 25,000 and in 1994 it was removed from endangered species list. Endangered Species Act's purpose is to protect those animals and plants which are at the risk of extinction and increase their number in the wild. It is strongest law implemented to save biodiversity. So grey whale species have increased due to the Endangered Species Act which is an example of protecting biodiversity through the passage of laws.
The other guy is right, and the more widespread impact over time would be less oxygen because plants convert CO2 into oxygen. There would be more CO2 in the air and humans would starve and be nutritionally deprived, although that's prob not environmental.
